Swift Xcode XML string to String of Array

Question

sorry can't get it to work.

I have an xml string:

<data>
   <project>123 first</project>
   <project>234 second</project>
   <project>345 third</project>
</data>

I now use a function where I look for project in the string and then find the correct value and append it to my StringArray

var StringArray: [String] = []

this works as expected but now the project is growing to over 2000 records in the xml file and it takes more than 15 seconds to get the values in the StringArray.

public func getArrayFromXMLString(xml: String, node: String) -> [String] {
    var xml2: String = xml
    var ArrayName = [String]()
    while xml2.range(of: "<" + node + ">") != nil {
        let i1 : Int = xml2.indexOf("<" + node + ">")!
        xml2 = xml2.right(xml2.length - i1)
        let i2 : Int = xml2.indexOf(">")!
        xml2 = xml2.right(xml2.length - i2 - 1)
        let i3 : Int = xml2.indexOf("<")!
        ArrayName.append(xml2.left(i3))
    }
    return ArrayName
}

(some functions are used for indexof, left and right)

I found a lot of examples with XMLParser but none with only the one property. I have obviously never used XMLParser.

Can someone guide me in the correct way please?

Joakim Danielson · Accepted Answer · 2021-11-22 15:21:04Z

1

It's not so complicated to use the XMLParser class, specially with this simple structure.

For the delegate we implement 3 of the protocol methods, two to keep track of if the currently parsed object is a project element and one to read the value.

class ParserDelegate: NSObject, XMLParserDelegate {
    var projects = [String]()
    var isProject = false

    func parser(_ parser: XMLParser, didStartElement elementName: String, namespaceURI: String?, qualifiedName qName: String?, attributes attributeDict: [String : String] = [:]) {
        if !isProject, elementName == "project" { isProject = true }
    }

    func parser(_ parser: XMLParser, didEndElement elementName: String, namespaceURI: String?, qualifiedName qName: String?) {
        isProject = false
    }

    func parser(_ parser: XMLParser, foundCharacters string: String) {
        if isProject { projects.append(string)}
    }
}

Example

let parser = XMLParser(data: data)
let delegate = ParserDelegate()
parser.delegate = delegate
parser.parse()
print(delegate.projects)

["123 first", "234 second", "345 third"]

answered Nov 22, 2021 at 15:21

Joakim Danielson

53.1k5 gold badges36 silver badges79 bronze badges

Sign up to request clarification or add additional context in comments.

2 Comments

Sander Wijnen Over a year ago

Thanks, I will check this tomorrow.

Sander Wijnen Over a year ago

thanks, the only thing I had to do was StringArray = delegate.projects

Collectives™ on Stack Overflow

Swift Xcode XML string to String of Array

1 Answer 1

2 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

2 Comments

Your Answer

Sign up or log in

Post as a guest

Related